package com.zmzncs.lmtc.common.util;

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import sun.misc.BASE64Encoder;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;
import java.util.Hashtable;
import java.util.Random;

@Slf4j
public class QRCodeUtil {

    private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "JPG";
    // 二维码尺寸
    private static final int QRCODE_SIZE = 300;
    // LOGO宽度
    private static final int WIDTH = 100;
    // LOGO高度
    private static final int HEIGHT = 100;

    /**
     * 创建图片
     * @param content   图片内容
     * @param imgPath   logo地址
     * @param needCompress  是否压缩LOGO
     */
    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = null;
        try {
            bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        assert bitMatrix != null;
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        if (imgPath == null || "".equals(imgPath)) {
            return image;
        }
        // 插入图片
        QRCodeUtil.insertImage(image, imgPath, needCompress);
        return image;
    }

    /**
     * 插入LOGO
     *
     * @param source 二维码图片
     * @param imgPath LOGO图片地址
     * @param needCompress 是否压缩
     */
    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) {
        File file = new File(imgPath);
        Resource resource = new ClassPathResource(imgPath);
        if (!file.exists()) {
            if(!resource.exists()){
                log.error("文件{}不存在", imgPath);
                return;
            }
        }
        Image src = null;
        try {
            if (file.exists()) {
                src = ImageIO.read(new File(imgPath));
            }
            if(resource.exists()){
                src = ImageIO.read(resource.getInputStream());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        assert src != null;
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) { // 压缩LOGO
            if (width > WIDTH) {
                width = WIDTH;
            }
            if (height > HEIGHT) {
                height = HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_SIZE - width) / 2;
        int y = (QRCODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    /**
     * 生成二维码(内嵌LOGO)
     *
     * @param content 内容
     * @param imgPath LOGO地址
     * @param destPath 存放目录
     * @param needCompress 是否压缩LOGO
     */
    public static String encode(String content, String imgPath, String destPath, boolean needCompress) {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);

        File file = new File(destPath);
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }

        String filePath = new Random().nextInt(99999999)+".jpg";

        try {
            ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
        } catch (IOException e) {
            e.printStackTrace();
        }

        return filePath;
    }

    /**
     * 生成二维码(内嵌LOGO)
     *
     * @param content 内容
     */
    public static String encode(String content) {
        BufferedImage image = QRCodeUtil.createImage(content, null, true);
        String jpg_base64 = null;

        try {
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();//io流
            ImageIO.write(image, FORMAT_NAME, byteArrayOutputStream);

            byte[] bytes = byteArrayOutputStream.toByteArray();//转换成字节
            BASE64Encoder encoder = new BASE64Encoder();
            jpg_base64 = encoder.encodeBuffer(bytes).trim();//转换成base64串
            jpg_base64 = jpg_base64.replaceAll("\n", "").replaceAll("\r", "");//删除 \r\n

            //        ImageIO.write(bufferedImage, "png", new File("D:/qrcode1.png"));
//            log.info("值为："+"data:image/jpg;base64," + jpg_base64);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return "data:image/jpg;base64," + jpg_base64;
    }

    /**
     * 生成二维码(内嵌LOGO)
     *
     * @param content 内容
     * @param imgPath LOGO地址
     * @param destPath 存储地址
     */
    public static void encode(String content, String imgPath, String destPath) {
        QRCodeUtil.encode(content, imgPath, destPath, false);
    }

    /**
     * 生成二维码
     *
     * @param content 内容
     * @param destPath 存储地址
     * @param needCompress 是否压缩LOGO
     */
    public static void encode(String content, String destPath, boolean needCompress) {
        QRCodeUtil.encode(content, null, destPath, needCompress);
    }

    /**
     * 生成二维码
     *
     * @param content 内容
     * @param destPath 存储地址
     */
    public static void encode(String content, String destPath) {
        QRCodeUtil.encode(content, null, destPath, false);
    }

    /**
     * 生成二维码(内嵌LOGO)
     *
     * @param content 内容
     * @param imgPath LOGO地址
     * @param output 输出流
     * @param needCompress 是否压缩LOGO
     */
    public static void encode(String content, String imgPath, OutputStream output, boolean needCompress) {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath,
                needCompress);
        try {
            ImageIO.write(image, FORMAT_NAME, output);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 生成二维码
     *
     * @param content 内容
     * @param output 输出流
     */
    public static void encode(String content, OutputStream output) {
        QRCodeUtil.encode(content, null, output, false);
    }

    /**
     * 解析二维码
     * @param file 二维码图片
     */
    public static String decode(File file) {
        BufferedImage image = null;
        String resultStr = null;
        try {
            image = ImageIO.read(file);
            BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(
                    image);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
            Result result;
            Hashtable<DecodeHintType, Object> hints = new Hashtable<>();
            hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
            result = new MultiFormatReader().decode(bitmap, hints);
            resultStr = result.getText();
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (image == null) {
            return null;
        }

        return resultStr;
    }

    /**
     * 解析二维码
     * @param path 二维码图片地址
     */
    public static String decode(String path) {
        return QRCodeUtil.decode(new File(path));
    }

    public static void main(String[] args) {
//        QRCodeUtil.encode("654654", null, response);
    }

}
